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19-3602; Rev 0; 3/05
MAX1577Z Evaluation Kit
The MAX1577Z evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX1577Z
white LED 1x/2x charge pump. The MAX1577Z EV kit
strobes a white LED at up to 1.1A using an on-board
pulse generator. In movie mode, it drives the LED at a
constant 220mA. The current levels are adjusted by
changing a resistor. The EV kit can also be used to
evaluate the MAX1577Y.
Features
♦ Selectable Flash/Movie Modes
♦ Up to 92% Efficiency (PLED / PBATT)
♦ 3% LED Current Regulation
♦ Adaptive 1x/2x Mode Switchover
♦ 2.7V to 5.5V Supply Voltage Range
♦ 8-Pin TDFN 3mm x 3mm IC Package
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
MAX1577ZEVKIT
0°C to +70°C
IC PACKAGE
8 TDFN (3mm x 3mm)
Component List
DESIGNATION
C1
C2
C3
C4
C5
QTY
1
1
1
1
1
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
2.2µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Panasonic ECJ1VB0J225K
TDK C1608X5R0J225K
D1
1
White LED flash emitter
Lumileds LXCL-PWF1
D2
1
Diode (SOD-323)
Central CMDD4448
4.7µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Panasonic ECJ1VB0J475K
TDK C1608X5R0J475K
JU1, JU3
2
2-pin headers
JU2
1
3-pin header
1
0.27Ω ±1%, 0.25W resistor (0805)
Panasonic ERJ-6RQFR27V
10µF ±20%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ106MG
Panasonic ECJ2FB0J106M
TDK C2012X5R0J106M
R2, R4, R5
3
100kΩ ±5% resistors (0402)
R3
1
10kΩ ±5% resistor (0402)
SW1
1
Momentary pushbutton switch
Panasonic EVQ-PHP03T
U1
1
MAX1577ZETA
(8-pin TDFN, 3mm x 3mm)
Top mark: AMQ
U2
1
MAX6422XS23-T (4-pin SC70)
None
3
Shunts, 2-position
None
1
MAX1577ZEVKIT PC board
0.047µF ±10%, 10V X7R ceramic
capacitor (0402)
Taiyo Yuden LMK105BJ473KV
TDK C1005X7R1C473K
0.01µF ±10%, X7R ceramic
capacitor (0402)
TDK C1005X7R1E103K or
equivalent
R1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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1
Evaluates: MAX1577Y/MAX1577Z
General Description
Evaluates: MAX1577Y/MAX1577Z
MAX1577Z Evaluation Kit
Table 1. Jumper Descriptions
JUMPER
SHORT 1-2
SHORT 2-3
OPEN
EN1 is pulled low by a 100kΩ resistor. EN1 can be
driven from an external pulse generator connected
to the EN1 pad on the left side of the EV kit.
JU1
EN1 connects to the output of
the on-board pulse generator.
JU2
EN2 connects to the output of
the on-board pulse generator.
JU3
Connects power to the onboard pulse generator.
JU4
JU4 is shorted on the PC board and connects the white LED to
the output of the MAX1577Z.
N/A
EN2 connects to IN for movie
mode.
EN2 is pulled low by a 100kΩ resistor. EN2 can be
driven from an external pulse generator connected
to the EN2 pad on the left side of the EV kit.
Power to the on-board pulse generator is
disconnected. Leave JU3 open when measuring
the quiescent current of the MAX1577Z.
N/A
Cut the trace shorting JU4 to use an external LED,
or when operating in voltage regulation mode.
Quick Start
•
Recommended Equipment
Adjusting the 100% Brightness Level
2.7V to 5.5V power supply or battery capable of
delivering 2.5A
The LED current is adjusted by changing the resistor
R1. Calculate the value of R1 with the following equation, where IOUT is the output current in amps for 100%
brightness:
Procedure
Follow the steps below to verify board operation:
1) Verify that shunts are connected across pins 1-2
of jumpers JU1, JU2, and JU3.
2)
3)
Preset the power supply to 4.2V.
Turn off the power supply. Do not turn on the
power supply until all connections are completed.
4)
Connect the positive power-supply terminal to the
pad on the EV kit labeled IN.
Connect the power-supply ground terminal to the
pad on the EV kit labeled GND.
5)
6)
Turn on the power supply. The LED will flash once
due to the on-board pulse generator circuit powering up.
7)
Press the button to flash the LED at 1.1A. The pulse
generator limits the flash duration to approximately
125ms.
8)
9)
Detailed Description
Move jumper JU2 to short pins 2-3 (selects movie
mode).
Verify that the LED is lit.
R1 =
For more information on setting the brightness, refer to
the MAX1577Y/MAX1577Z data sheet.
Control Inputs
The MAX1577Z has two inputs for selecting 100%,
33%, and 20% output current, or shutdown. Using JU1
and JU2 (see Table 1), these inputs can be connected
to the output of the on-board pulse generator for a
strobed output, while EN2 can be connected to IN for
movie mode, pulled low, or driven from an external
pulse generator. With the default 100% current setting
(R1 = 0.27Ω), the selectable output currents are
described in Table 2.
Table 2. Default Output Currents
JU1
1-2
OPEN
2
0.3V
IOUT
JU2
FUNCTION
1-2
1100mA Flash
2-3
220mA Movie Mode/1100mA Flash
OPEN
367mA Flash
1-2
220mA Flash
2-3
220mA Movie Mode
OPEN
Shutdown
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MAX1577Z Evaluation Kit
Evaluating the MAX1577Y
To evaluate the MAX1577Y, carefully remove the
MAX1577Z from the EV kit and replace with the
MAX1577Y. Free samples of the MAX1577Y are available
from Maxim.
To evaluate the voltage regulation settings of the
MAX1577Y, follow the procedure in the Voltage
Regulation section.
Shutdown
Voltage Regulation
To place the MAX1577Z in low-power shutdown mode,
remove the shunt from both jumpers JU1 and JU2. For
measuring quiescent current while in shutdown mode,
also remove the shunt from JU3 to disconnect the onboard pulse generator from the supply.
The MAX1577Y/MAX1577Z can provide a constant voltage output. In voltage-regulation mode, the MAX1577Z
has a fixed 5.1V output. The output voltage of the
MAX1577Y is selected using JU1 and JU2. Refer to the
MAX1577Y/MAX1577Z data sheet for more information.
Connecting External LED(s)
To configure the MAX1577Z EV kit for voltage regulation, cut the trace shorting JU4. Connect the load from
the pad labeled OUT to the pad labeled GND.
To connect external LED(s) to the MAX1577Z EV kit, cut
the trace shorting JU4. Connect the anode(s) of the
external LED(s) to the pad labeled LED+. Connect the
cathode(s) to the pad labeled GND.
Component Suppliers
SUPPLIER
Central Semiconductor
PHONE
631-435-1110
WEB
www.centralsemi.com
COMPONENTS
Diodes
Kamaya
260-489-1533
www.kamaya.com
Resistors
Lumileds
408-435-6044
www.lumileds.com
LEDs
Panasonic
714-373-7939
www.panasonic.com
Capacitors, resistors, switches
Taiyo Yuden
408-573-4150
www.t-yuden.com
Capacitors
TDK
847-803-6100
www.component.tdk.com
Capacitors
Vishay
402-563-6866
www.vishay.com
Resistors
Note: Indicate that you are using the MAX1577Y/MAX1577Z when contacting these component suppliers.
_______________________________________________________________________________________
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3
Evaluates: MAX1577Y/MAX1577Z
When using the on-board pulse generator, the LED
flashes when power is first applied to the EV kit. This is
due to the pulse generator circuit and not the MAX1577Z.
To use external pulse generators, remove the shunts
from both JU1 and JU2, and connect the pulse generators to the pads labeled EN1 and EN2. For a simple
flash at 100% brightness, connect EN1 to EN2 and
drive with a single pulse generator.
Evaluates: MAX1577Y/MAX1577Z
MAX1577Z Evaluation Kit
C1
2.2µF
IN
IN
6
2
3
CP
CN
IN
C3
10µF
C2
4.7µF
GND
5
OUT
OUT
8
GND
U1
PULSE
2
EN1
MAX1577Z
1
4
R4
100kΩ
EN1
3
2
IN
1
R3
10kΩ
SW1
JU3
JU2
1
PULSE
2
D2
1
3
LED+
7
IN
EN2
2
CS
EN2
R5
100kΩ
R2
100kΩ
GND
JU4
JU1
1
D1
R1
0.27Ω
VCC
RESET
4
PULSE
U2
C5
0.01µF
2
C4
0.047µF
MAX6422
GND
SRT
3
Figure 1. MAX1577Z EV Kit Schematic
4
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MAX1577Z Evaluation Kit
Evaluates: MAX1577Y/MAX1577Z
Figure 2. MAX1577Z EV Kit Component Placement Guide—Component Side
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5
Evaluates: MAX1577Y/MAX1577Z
MAX1577Z Evaluation Kit
Figure 3. MAX1577Z EV Kit PC Board Layout—Component Side
6
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MAX1577Z Evaluation Kit
Evaluates: MAX1577Y/MAX1577Z
Figure 4. MAX1577Z EV Kit PC Board Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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